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  <title>检查图像是否为真彩色图像</title>

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</div><hr /><div id="function.imageistruecolor" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imageistruecolor</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.3.2, PHP 5)</p><p class="refpurpose"><span class="refname">imageistruecolor</span> &mdash; <span class="dc-title">检查图像是否为真彩色图像</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imageistruecolor-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>imageistruecolor</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
   )</div>

  <p class="para rdfs-comment">
   <span class="function"><strong>imageistruecolor()</strong></span> 检查
   <em><code class="parameter">image</code></em> 图像是否为真彩色图像。
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.imageistruecolor-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    <dt>
<em><code class="parameter">image</code></em></dt>

<dd>
<p class="para">由图象创建函数(例如<span class="function"><a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的图象资源。</p></dd>

   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.imageistruecolor-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   如果 <em><code class="parameter">image</code></em> 是真彩色图像返回 <strong><code>TRUE</code></strong>，否则返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.imageistruecolor-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3173">
    <p><strong>Example #1 Simple detection of true color image instances using <span class="function"><strong>imageistruecolor()</strong></span></strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;$im&nbsp;is&nbsp;an&nbsp;image&nbsp;instance<br /><br />//&nbsp;Check&nbsp;if&nbsp;image&nbsp;is&nbsp;a&nbsp;true&nbsp;color&nbsp;image&nbsp;or&nbsp;not<br /></span><span style="color: #007700">if(!</span><span style="color: #0000BB">imageistruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">))<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;Create&nbsp;a&nbsp;new&nbsp;true&nbsp;color&nbsp;image&nbsp;instance<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$tc&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">),&nbsp;</span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">));<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">imagecopy</span><span style="color: #007700">(</span><span style="color: #0000BB">$tc</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$im</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">),&nbsp;</span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">));<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$im&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$tc</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$tc&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">NULL</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;Continue&nbsp;working&nbsp;with&nbsp;image&nbsp;instance<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>

 <div class="refsect1 notes" id="refsect1-function.imageistruecolor-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。</span></p></blockquote>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.imageistruecolor-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.imagecreatetruecolor.html" class="function" rel="rdfs-seeAlso">imagecreatetruecolor()</a> - 新建一个真彩色图像</span></li>
   </ul>
  </p>
 </div>

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